1. What is an RV Solar System Size Calculator?

Definition: This calculator estimates the required solar panel system size (in kW) for an RV based on daily energy needs, peak sun hours, and system efficiency.

Purpose: It helps RV owners determine the appropriate solar system capacity to meet their energy requirements while on the road.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Solar system size (kilowatts)
• \( E_{kWh} \) — Daily energy consumption (kilowatt-hours)
• \( t_{sun} \) — Peak sun hours per day
• \( \eta_{solar} \) — System efficiency factor (0-1)

Explanation: The formula converts your daily energy needs into the required solar panel capacity by accounting for available sunlight and system losses.

3. Importance of Proper Solar Sizing

Details: Correct sizing ensures your RV has sufficient power without overspending on unnecessary solar capacity. It balances energy needs with available roof space and budget.

4. Using the Calculator

Tips: Enter your daily energy needs in kWh, average peak sun hours (default 4), and system efficiency (default 0.85). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my daily energy needs?
A: Calculate the sum of all your appliances' wattage multiplied by hours of daily use, then divide by 1000 to get kWh.

Q2: What are typical peak sun hours?
A: Most locations in the US get 4-6 peak sun hours daily. Southern states get more than northern states.

Q3: Why is system efficiency less than 1?
A: Efficiency accounts for losses in wiring, charge controllers, battery charging, and panel orientation.

Q4: Should I round up the calculated size?
A: Yes, it's recommended to round up to the nearest standard panel size and add 10-20% buffer for cloudy days.

Q5: Does this include battery storage?
A: No, this calculates solar panel size only. Battery capacity should be calculated separately based on your nighttime needs.